When using the high performance graphics (System preferences > Energy Saver > Graphics > Higer Performance) do you get a 'shudder' when dragging a browser window such as firefox from side to side? Oddly enough it doesn't have the same problem when you use the less powerful graphics gpu!!! (System preferences > Energy Saver > Graphics > Better Battery Life) I get it on Opera and Firefox, it looks awful, like when using a pc without the correct graphics card drivers installed! (I think may actually be a driver issue because there are other graphics related problems on this model too). Can those of you who have a new MBP test this out please? I plan to go into the Apple store tomorrow to see if their's do it too, but am interested to know if the problem affects any of you as well. Edit: Ok this is wierd! I just logged back in to the higher performance GPU and it's stopped happening!!!! (ie is working normal now) :-/ Edit 2: Ten minutes later, and it's started to happen again... Edit 3: Logged out then back in to the lower performance gpu, been logged in for the same time as edit 2 (well more, 15 mins) but the problem is not happening, indicating the problem lies with the dirvers for the higer performance 9600M GT (or the card itself).